HTC One Unlocked Edition (2013) sees a price drop in anticipation of the All New One
The All New HTC One (M8) will be officially announced in less than two weeks from now, on March 25. So HTC thought that this would be a good time to drop the price of last year’s One Unlocked Edition - which is SIM unlocked, and also comes with an unlocked bootloader. This was initially sold for $599.99 (or $574.99 at some point), so that’s $100 off.
Of course, buying the 2013 HTC One Unlocked Edition now is not exactly a wise thing do to, as the 2014 HTC One will likely be released shortly after its announcement, possibly as soon as early April. The new handset will probably be a bit more expensive, but perhaps the improvements that it brings are worth the higher price. Among the expected improvements we'll mention a larger display (5 inches), Android 4.4 KitKat with Sense 6.0 UI, a quad-core Snapdragon 801 processor, and a dual-lens rear camera.
Anyhow, if you still want to get the older HTC One Unlocked Edition, this can be purchased online from HTC, and it’s available only in the US. Check it out at the first source link below. Apart from being fully unlocked, this variant of the HTC One is identical to the regular model that can be seen in this gallery: